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Wyszukujesz frazę "Farzipoor Saen, Reza" wg kryterium: Autor


Wyświetlanie 1-2 z 2
Tytuł:
Detecting congestion in DEA by solving one model
Autorzy:
Shadab, Maryam
Saati, Saber
Farzipoor Saen, Reza
Khoveyni, Mohammad
Mostafaee, Amin
Powiązania:
https://bibliotekanauki.pl/articles/2099443.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
data envelopment analysis
vertex units
congestion
Opis:
The presence of input congestion is one of the key issues that result in lower efficiency and performance in decision-making units (DMUs). So, determination of congestion is of prime importance, and removing it improves the performance of DMUs. One of the most appropriate methods for detecting congestion is Data Envelopment Analysis (DEA). Since the output of inefficient units can be increased by keeping the input constant through projecting on the weak efficiency frontier, it is unnecessary to determine the congested inefficient DMUs. Therefore, in this case, we solely determine congested vertex units. Towards this aim, only one LP model in DEA is proposed and the status of congestion (strong congestion and weak congestion) obtained. In our method, a vertex unit under evaluation is eliminated from the production technology, and then, if there exists an activity that belongs to the production technology with lower inputs and higher outputs compared with the omitted unit, we say vertex unit evidences congestion. One of the features of our model is that by solving only one LP model and with easier and fewer calculations compared to other methods, congested units can be identified. Data set obtained from Japanese chain stores for a period of 27 years is used to demonstrate the applicability of the proposed model and the results are compared with some previous methods.
Źródło:
Operations Research and Decisions; 2021, 31, 1; 77--96
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A slacks-based nonlinear DEA model with integer data : an application to departments of the Islamic Azad University, Karaj Branch in Iran
Autorzy:
Moazenzadeh, Zahra
Saati, Saber
Saen, Reza Farzipoor
Matin, Reza Kazemi
Sohraee, Sevan
Powiązania:
https://bibliotekanauki.pl/articles/2175850.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
data envelopment analysis
non-radial model
integer-valued data
slack based measure
Opis:
Although Data Envelopment Analysis (DEA) assumes that inputs and outputs take non-negative real values, in some realworld cases, data are integer-valued. In some situations, rounding a fractional value to the closest integer can lead to a misleading evaluation of efficiency and in some cases may lead to an infeasible projection point. To date, various radial and non-radial models have been presented. This paper proposes a slacks-based non-linear model that guarantees an integer-valued reference point for all integer targets. Also, the reference point of each target is feasible under the proposed model. The lack of a need to round answers to the closest whole value is an advantage of this method. In addition, the results of this model are compared with other models. An example is used to clarify the suggested method.
Źródło:
Operations Research and Decisions; 2022, 32, 3; 80--91
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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